Simple Summary

Upgrade the Aave protocol instances from v3.6 to v3.7

Motivation

Aave v3.7 focused on non-invasive simplification of the protocol. It includes the following changes and features:

• Simplification of eModes’ configuration, adding an isolated flag.
• Removal of isolated collaterals and borrowable in isolation, features not useful anymore.
• Removal of the L2 sequencer oracle.
• Explicit removal of the flow to drop reserves, making the reserves list append-only.
• Small improvements on liquidation calculations.

Specification

Before upgrading the implementations, the payload cleans up reserve configuration flags and settings that are removed in v3.7. For each reserve:

• Reset debtCeiling: If a reserve has a non-zero debt ceiling, it is set to zero via setDebtCeiling(reserve, 0). This also resets isolationModeTotalDebt to zero.
• Disable borrowableInIsolation: If a reserve has borrowableInIsolation enabled, it is set to false via setBorrowableInIsolation(reserve, false).
• Additionally, if a sequencer uptime price oracle sentinel is configured, it is unset via setPriceOracleSentinel(address(0)), as this feature is removed in v3.7.

After the cleanup, the payload upgrades the core protocol contracts:

• Upgrade Pool implementation: The Pool contract proxy is updated to point to the new v3.7 implementation via POOL_ADDRESSES_PROVIDER.setPoolImpl(POOL_IMPL).
• Upgrade PoolConfigurator implementation: The `PoolConfigurator contract proxy is updated to the new v3.7 implementation via POOL_ADDRESSES_PROVIDER.setPoolConfiguratorImpl(POOL_CONFIGURATOR_IMPL).

Part 2 is applied on the following networks: Ethereum (Core, Lido), Polygon, Avalanche, Arbitrum, Base, BNB, Linea, Plasma and Mantle.

Alongside the v3.7 implementation upgrade, this proposal also replaces the current RiskSteward with a newly deployed steward compatible with v3.7. As part of the transition, the existing stewards will have their RISK_ADMIN role revoked on the corresponding ACL_MANAGER, and the new stewards will be granted the role via:

• ACL_MANAGER.addRiskAdmin(NEW_RISK_STEWARD)
• ACL_MANAGER.removeRiskAdmin(OLD_RISK_STEWARD)

The new stewards are wired in across the following instances: Ethereum (Core, Prime, EtherFi), Polygon, Avalanche, Arbitrum, Optimism, Base, BNB, Scroll, Gnosis, Linea, Sonic, Celo, Plasma, Mantle, MegaEth, XLayer.

Additionally, on the instances where GHO is listed as a reserve, GHO is blacklisted on the new RiskSteward via setAddressRestricted(GHO_UNDERLYING, true), since GHO is managed by its own dedicated stewards. The instances where this is applied are: Ethereum Core, Ethereum Prime, Arbitrum, Avalanche, Base, Gnosis, Mantle, Plasma and XLayer.

The original proposal has been reviewed by Certora at be21f7354a7e378393515ffd4ebf2d60ca2fcea0. Since than it has been amended with the RiskSteward migration, which has been reviewed by Certora as well. The proposal diff can be found here.

References

• Implementation
• Tests
• Diffs
• Snapshot
• Discussion

Copyright

Copyright and related rights waived via CC0.